Inspection, Maintenance And Repair; Inspection; Maintenance; Cleaning The Pump - VERDER VERDERFLEX Dura 55 Series Operating Manual

8. Inspection, Maintenance
and Repair
Only trained service technicians should be employed for
fitting and repair work. Present a pumped medium
certificate (DIN safety data sheet or safety certificate)
when requesting service.
Risk of injury due to running pump or hot parts!
Do not carry out any repair/maintenance work on a pump
X
in operation.
Allow the pump to cool down completely before starting
X
any repair work.
If inspection cover is removed for cleaning the pump
X
cavity, isolate the power supply until inspection cover is
replaced.
Risk of injury due to pressure buildup!
Do not carry out any repairs/maintenance work on a
X
pump in operation.
Do not block the breather tube which is designed for
X
pressure relief.
In the unlikely event of a hose burst which leads to
X
blockage of the breather tube - safely relieve the
pressure inside the casing before dissembling the pump.
Risk of injury and poisoning due to hazardous pumped
liquids!
Use protective equipment when carrying out any work on
X
the pump.

8.1 Inspection

The inspection intervals depend on the pump operating
cycle.
1. Check at appropriate intervals:
– Normal operating conditions unchanged
2. For trouble-free operation, always check the following:
– Lubricant level
– No leaks
– No unusual running noises or vibrations
– Hose in position

8.2 Maintenance

These pumps are generally maintenance-free and any
work should normally be limited to inspections and pump
lubricant changes as required; these may be more
frequent in dust and/or hot condition.
Original instructions (en)
DANGER
WARNING
© Verder Liquids B.V
Dura 55 series - Operating manual

8.2.1 Cleaning the pump

Risk of electrocution!
Have all electrical work carried out only by qualified
X
electricians.
High water pressure or spray water can damage motors!
Do not clean motors with water or steam jet.
X
1. Clean large-scale grime from the pump.
2. Rinse the
(follow the cleaning protocol as listed in (g8.2.2 Cleaning
protocol for hoses).

8.2.2 Cleaning protocol for hoses

VERDERFLEX hoses should be cleaned with the following
protocol –
NBR, NR and CSM Hoses:
VERDERFLEX NBR, NR and CSM hoses should be
X
cleaned with the following protocol:
1. First flush 0.5% Nitric Acid (HNO3) solution at up to 50°C,
max 10-15 minutes
2. Second flush
at up to 50°C, max 10-15 minutes and eventually steamed
open ends for 15 minutes at up to 110°C
3. Final flush: flush with clean water to remove all traces of
cleaning solutions
EPDM Hoses:
VERDERFLEX EPDM hoses should be cleaned with the
X
following protocol:
1. First flush 0.5% Nitric Acid (HNO3) solution at up to 50°C,
max 10-15 minutes
2. Second flush 5% Caustic soda (NaOH) solution at up to
50°C, max 10-15 minutes and eventually steamed open
ends for 15 minutes at up to 130°C
3. Final flush: flush with clean water to remove all traces of
cleaning solutions
Version 01
DANGER
Note
hose carefully to remove
5% Caustic soda (NaOH)
chemicals
solution
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